Clear Fdb - Extreme Networks ExtremeWare Command Reference Manual

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FDB Commands

clear fdb

On the "i" series of switches:

clear fdb {<mac_address> | blackhole | ports <portlist> | remap | vlan

<vlan name>}

On the "e" series of switches:

clear fdb {<mac_address> | blackhole | ports <portlist> | vlan <vlan name>}

Clears dynamic FDB entries that match the filter.

Syntax Description

Specifies a MAC address, using colon-separated bytes.

Specifies the blackhole entries.

Specifies one or more ports. May be in the form 1, 2, 3-5, 2:*, 2:5, 2:6-2:8.

Clears the remapped and questionable FDB entries.

NOTE: This option is only available on the "i" series of switches.

Specifies a VLAN name.

Clears all dynamic FDB entries.

Usage Guidelines

This command clears FDB entries based on the specified criteria. When no options are specified, the

command clears all dynamic FDB entries.

On the "i" Series of Switches. The system health checker also checks the integrity of the FDB. If you

enable the system health checker, a section of the FDB memory on each module's switching fabric is

non-intrusively compared to the software copy of the FDB. The switch takes one of the following

actions if it detects a bad entry:

• If the entry is not in use—remaps around the entry location

• If the entry is in use, but is safely removable (most MAC and IP-DA entries)—removes the

questionable entry, allows the table to be rebuilt naturally, and remaps around the entry location

• If the entry is in use and is not safely removable (MAC_NH, IPSA, IPMCDA, IPDP, IPSP,

IPXSN)—sends a warning message to the log

If the switch detects more than eight questionable entries, it executes the configured failure action and

stops remapping on the switch fabric. To see the questionable and remapped entries, use the

command. The following information is displayed:

• Questionable entries are marked with a "Q" flag

• Remapped entries are marked with an "R" flag

• Total FDB count

ExtremeWare 7.5 Command Reference Guide

Extremeware 7.5